Heat trap
United States Patent D351899

Isber, George M. (1 Sir Constantine Drive, Markham, Ontario, CA)
Application Number:
Publication Date:
Filing Date:
Primary Class:
Field of Search:
285/124, 285/150, 285/157, 285/181, 137/247.51, 137/171, 4/DIG.14, 122/275, 122/355, 165/97, 198/952, D23/268, D23/266, D23/289, D23/308, D23/318, D23/323, D23/328, D23/330
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US Patent References:
4964394Water heater with heat trap in dip tubeOctober, 1990Treatt
4286573Water heater heat trap assemblySeptember, 1981Nickel
3877518Heat exchange coilApril, 1975Dreksler285/157
3251408Cooling systemsMay, 1966Watson et al.165/97
1237144N/AAugust, 1917Allen137/171
0474205N/AMay, 1892Avery285/150
0028567N/AMay, 1860BrinkmanD23/268

Foreign References:
CA2016295May, 1989
Primary Examiner:
Word, Hugo A.
Assistant Examiner:
Watterson, Eric
Attorney, Agent or Firm:
Hughes, Ivor M.
Hughes, Neil H.
Sarkis, Marcelo K.
1. The ornamental design for a heat trap, as shown and described.


FIG. 1 is a perspective view of a heat trap showing my new design;

FIG. 2 is a side elevation taken from the right of FIG. 1;

FIG. 3 is a side elevation taken from the left of FIG. 1;

FIG. 4 is a rear elevation;

FIG. 5 is a front elevation;

FIG. 6 is a top plan view taken from the top of FIG. 4; and,

FIG. 7 is a bottom plan view taken from the bottom of FIG. 5.